Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-05-11
Astronomy and Astrophysics
Astrophysics
7 pages, 6 figures Accepted for publication in Astronomy and Astrophysics
Scientific paper
10.1051/0004-6361:20052969
We present Odin observations of the AGB star W Hya in the ground-state transition of ortho-H2O, 1(10)-1(01), at 557GHz. The line is clearly of circumstellar origin. Radiative transfer modelling of the water lines observed by Odin and ISO results in a mass-loss rate of (2.5 +/- 0.5)E-7 Msol/yr, and a circumstellar H2O abundance of (2.0 +/- 1.0)E-3. The inferred mass-loss rate is consistent with that obtained from modelling the circumstellar CO radio line emission, and also with that obtained from the dust emission modelling combined with a dynamical model for the outflow. The very high water abundance, higher than the cosmic oxygen abundance, can be explained by invoking an injection of excess water from evaporating icy bodies in the system. The required extra mass of water is quite small, on the order of ~ 0.1 earth mass.
Bergman Per
Elitzur Moshe
Frisk Urban
Hasegawa Takuya
Hjalmarson Å..
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